package com.dong.c12_netty_websocket;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;

import java.time.LocalDate;
import java.time.LocalDateTime;

/**
 * <h1></h1>
 * {@link WebSocketFrame} 表示一个文本  frame
 * @author : dzj
 * @create: 2021-03-09 22:59
 */
public class WebSocketServerHandler extends SimpleChannelInboundHandler<TextWebSocketFrame> {
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, TextWebSocketFrame msg) throws Exception {
        System.out.println("服务器端收到消息: "+msg.text());
        ctx.channel().writeAndFlush(new TextWebSocketFrame("服务器时间: "+ LocalDateTime.now()+msg.text()));
    }
    //当web客户端连接后, 触发方法
    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        //id表示唯一的值, longText是唯一的 , shortText 不是唯一的
        System.out.println("handler added 被调用"+ctx.channel().id().asLongText());
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        System.out.println("handler Removed 被调用"+ ctx.channel().id().asLongText());
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        System.out.println("异常发生, "+cause.getMessage());

        ctx.close();

    }
}
